An intriguing historical feature of one of America's most beautiful stretches of highway is facing the end of the road after it was branded a 'national security risk' by . The I-19 from Tuscon to is a relic of the 1970s and showcases the United States' failed attempt to convert to the metric system, with the roadway measured in kilometers. There are now fears that the 'un-American' signage, which is beloved by locals, could be axed by the Trump administration after the former host's comments.
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